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Ductless heat pump / AC outdoor unit installed on my porch?

I am looking at the options of installing a ductless mini split heat pump (18000 BTU) and was given 3 options:

1). Wall bracket - lowest cost one but may have vibration/noise issue according to the contractor
2). Concrete slabs on the ground - recommended by the contractor but highest cost because of the amount of the work
3). On my wooden porch - may have noise issue because it will be closed to my living room window

The porch option seems pretty good to me because a. it has a roof so the unit will be protected against snow/rain and b. because it's already perfectly level so it cost less than option 2. As to the noise, I think it should be all right because it's at least 1 feet from the windows and it's my living room, not my bedrooms.

prefab slabs work great. IF you're tight on cash, get a shovel out, make a nice 4" deep by 4' swquare space. Fill it with limestone gravel 2" above grade and tamp it down good. Now you have a very nice level spot for a precast pad or even jsut a palstic pad.

If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.

prefab slabs work great. IF you're tight on cash, get a shovel out, make a nice 4" deep by 4' swquare space. Fill it with limestone gravel 2" above grade and tamp it down good. Now you have a very nice level spot for a precast pad or even jsut a palstic pad.

If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.

prefab slabs work great. IF you're tight on cash, get a shovel out, make a nice 4" deep by 4' swquare space. Fill it with limestone gravel 2" above grade and tamp it down good. Now you have a very nice level spot for a precast pad or even jsut a palstic pad.

If you're really ambitios, you can get some 2x4's and for your own pad over the gravel.

How would you anchor the unit to the prefab slab? There's nothing to lag to.

"The bitterness of poor quality remains long after the sweetness of low price is forgotten". --Benjamin Franklin
"Don't argue with an idiot, they will drag you down to their level and beat you with experience". --Mark Twainhttp://www.campbellmechanical.com

Here is an idea I use to anchor minisplits to preformed pads. I take 10' of all thread and cut in 4 pieces. Put a nut and washer on one end then drive through mounting flange and pad into the ground. May not keep thieves from taking unit but it is very secure from moving and turning over. Of course it helps if your not in rocky country.